Assertion : The energy `(E )` and momentum `(p)` of a photon are related by `p = E//c`.
Reason : The photon behaves like a particle.
A. If both assertion and reason are true and the reason is the correct explanation of the assert ion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false
